Valve for controlling oil burners



J. E. BOLLING VALVEFOR CONTROLLING OIL BURNERS Filed Oct. 18. 1924 2sheets-sheen jbveiz/fin c/a/m 550/1;

May 1, 1928. 1,668,001

J. E. BOLLING VALVE-FOR CONTROLLING OIL BURNERS Filed Oct. 18. 1924 2Sheets-51195112 Patented May 1, 1928 UNITED STATES 1,668,001 PATENTOFFICE.

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VAEVE FOR CONTROLLING 011 B'URHERQ.

implication fled October-18, 1924. Serial Zfle.

This invention relates to an automatic regulating valve designedparticularly for use in controlling the flow of fuel from oil burnernozzles.

The purpose of the invention is to provide an arrangement which willinsure when required a prompt or abrupt starting and shutting off of thefeed of oil to the nozzle in order to prevents. gradual change of flowl0 and consequent dripping of oil from the nozzle upon the starting andstopping of the operation of the burner. Likewlse, it is the purpose ofthe invention to provide means which will upon a starting operation ofthe burner insure prompt delivery of the fuel under some predeterminedpressure and in suitable condition for instant combustion, in order toavoid the preliminary incomplete combustion of the fuel when the mixtureof fuel and air varies or how thereof is increased gradually from zeroto the desired rate for the proor operation or the burner. Such lastmentioned undesirable operation of oil burners invariably results whenthere is any ap reciahle length of tubing or space within w ioh the oilmay collect between the burner noszle and the fuel pump, and when thereis no quick acting opening and shut ofi valve located at the nozzle.further purpose of the invention is to provide meansfor draining theiuel from t e shut off valve and from the tubing between such nozzlevalve and the .pump, back to the source of suppl of fuel, which meansiseffective after t e valve at the nozzle 1s closed, in order'thatwhen thepump again starts it will immediately pump the fuel, p

duit when the. operatlon of the pump or under the desired operatingcondition, to the nozzle.

Thesegeneral purposes of the invention, and others are accomplished byaconstruction as shown in the drawing, in which Fi re 1 is a verticalsectional view of the regu ating valve.

Fig. 2 is an end view of the valve with the casing partly in section.

Fig. is a sectlonal view taken on the hue 33. of Fig. 1.

Fi' 4 is a. sectional detail taken along the 50 line of Fig. 2.

Fig. 5 is a sectional detail taken along the line 55'of Fi 4.

Figs. 16 and are sectional details taken along the lines 6 and 7 of Fig.5.

Fig. 8 is a diagrammatic view showing the 'duit between the nozzle andthe pum relationship between the regulating valve, fuel pump and floatchamber from which the fuel pump draws the liquid fuel for de livery tothe burner nozzle.

The construction illustrated is particu larly designed for use inconnection with oil burning apparatus such as descrihed in applicationfor patentof-James G. Armstrong, Serial No. 738,647, filedfieptemberit), Oil burners of that class are arraneed "for delivering a richmixture oi fuel and air to the burner'nozzle. The pump is separated fromthe nozzle by a length of conduit, which conduit might under somecircumstances retain some fuel oil after the pump has stopped operating.Then, upon start ing an operation of the pump, the fuel in the conduitbetween the pump and the nozzle is forced through and drips from thenozzle preliminary to the delivery of the jet of fuel and air in theconstant normal proportion. Oil burners of this class, designed mainlyfor house heating purposes, have a capacity in excess of that normallyrequired and therefore are only intermittently operated for shortperiods. This intermittent operation of the burners results in thelikelihood of v'ariationin' the richness of the mixture delivered to thenozzle since, upon stopping, some of the fuel .oil may remam in the condan u on, startin the pressure only gra ually rises to the esired point.

The construction illustrated. overcomes such undesirable conditions byproviding means for draining back to the source of suply .any fuel oilwhich may be in the con-;

other delivery means is interru ted. The improved construction alsoprovi es for instantly closing a valve" located at the nozzle at suchcessation ofthe operation of the pump. Likewise, the same valveautomatically opens only after the pump develops the requiredpredetermined pressure in the fuel line leading to the nozzle.

In order to accomplish these purposes, use is made of a valve structurewhich may open or close communication between thev nozzle and its supplyconduit and mai provide suitable communication between t e'sup lyconduit and a return drain, when the vs vs closes communication betweensuch suppl conduit and the nozzle. A spring actuate toggle is providedfor producing a quick m throw of the valve, this toggle mechanism beingin turn under the control of a pressure motor, and the valve is providedwith passageways suitable for allowing the pressure to be developed inthe motor casing or, when re uired, allowing any oil which may be in succasing to be drained out back to the source of supply.

Fig. 8 of the drawing shows in diagram a pump 1, such as above referredto, a float chamber 2 for supplying fuel oil to the pump, a burnernozzle 3, a conduit 4: leading from the pump to the burner nozzle, animproved regulating valve 5 and a return drain conduit 6 from theregulating valve to the float chamber. The pump 1 received its supply offuel from the float chamber through conduit 7 and is adapted, asexplained in the application for patent above referred to, to deliverfuel and air under pressure and at a constant ratio to the conduit 4 andnozzle 3, the pump intermittently operating under thermostatic control.Between operations of the fuel pump, communication between conduit 4 andnozzle 3 is closed by a valve 8, Fig. 1. This valve, however, at suchtime provides communication between the passageway 9 leading to theconduit 4 and the interior of the casing 10 surrounding the upper partof the valve and also diaphragm motor 11. A passageway 12 in valve 8provides communication between passageway 9 and a chamber 13 below thevalve when the valve is in its upper osition, as shown in Fig. 1, atwhich time it prevents communication between the passageway 9 and nozzle3. The chamber 13 is closed b a plug 14, but communicates through anoter passageway 15 in valve 8 with the interior of casing 10 when thevalve is in its upper position. Accordingly, when the pump or compressorstarts to operate, the pressure developed thereby is communicated to theinterior of casin 10 causing an upward movement of the iaphragm motor11. This results, through an operation of the toggle 16, in throwing thevalve 8 downward with its transverse passageway 17 in alinement with thepassageways 9 and 18, the latter communlcatin with the dischargepassageway 19 of nozz e 3.

The toggle 16, formed b the arms 20 and 21, is connected by a yo e 22 tothe base of the diaphragm motor 11. Thus when the diaphragm motor iscompressed, the arms 20 and 21 swing upwardly around their respectlvepivots 23 and 24. Until the toggle passes its dead center and spring 25becomes effective for rapidly swinging the arm 20 downwardly around thepivot 27 the valve 8 is thusquickly forced from its closed to its openposition. Upon a drop in pressure within the casing 10, which occurswhen the operation of compressor 1 is stopped, the diaphragm motor isinstantly returned to its normal condition under the action of-a coiledtension spring 28 bearing at its end 29 against a tubular member 30movable with the diaphragm motor and at its 0 posite end against acollar 31 fixed to a stu 32 extending downwardly from the cap 33 ofcasing 10. Pressure within casing 10 is relieved through a port 34 invalve 8, this port serving to provide communication between thepassageway 9 at the bottom of casing 10 and the interior of the casingwhen the valve is in its upper position, as shown in Fig. 4. Upon thereverse action of the diaphragm motor 11, as driven by spring 28, thequick throw toggle mechanism is again actuated by spring 25, returningthe valve 8 to its upper position where it closes communication betweenthe nozzle 3 and passageway 9. Any oil that may remain in the assageway9 can drain down into the c amber 13 through the port 12 in valve 8 andlikewise any oil which may be in chamber 10 can drain through the rt 15into the chamber 13, from which it is returned by wnduit 6 to the floatchamber 2.

The operation of the construction is dependent upon changes in pressurein the fuel conduit 4, such changes in pressure in turn being dependentupon operations of a thermostatically controlled motor-driven pump.Normally with the valve 8 closed, any fuel oil in the conduit 4,passageway 9, or within valve casin 10 may drain back into the returnconduit 6. Therefore, upon startin the operation of the burner there'islittle 011 which may be pushed along in advance of the required mixture.When the pressure rises to a point suflicient to result in an operationof the diaphragm motor 11, valve 8 rapidly shifts to its fully 0 enposition under the action of the quick t row tog le mechanism. Thus whenthe nozzle does eliver fuel oil, the oil is delivered at full operatingpressure without any ob'ectionable preliminary flow of oil under 1; egradual risin ressure. Also, in the reverse operation 0 t e valvestructure, when the pressure falls, due to stopping the motor, the valveis instantly thrown to its fully closed position.

Although but one speci c embodiment of this invention has been hereinshown and described, it will be understood that details of theconstruction shown may be altered or omitted, without departin from theinvention as defined by the fol owing claims.

I claim:

1. In combination in a fluid fuel burner a fuel nozzle, a fuel conduitleading to said nozzle, a drain opening into said conduit, means forsupplying fuel under pressure to said conduit, and a valve controllingthe admission of fuel to said nozzle, said valve being adapted to beopened and to simultaneously close said drain by a; predeterminedpressure in said conduit.

Ill!) 2. In combination in a fluid fuel burner, a fuel nozzle, :1 pumpfor supplying a mixture of air and 011 under pressure, a constantleveloil chamber connected to the oil inlet of said pump, a conduit leadingfromthe outlet of said pump to the nozzle, a drain connection from thenozzle to said chamber, and a valve operated by pressure in said conduitfor controlling the connection of said conduit to the nozzle or to saiddrain connection.

3. In combination in a fluid fuel burner, a burner nozzle, a drain, afuel supply line, means for supplying fuel under pressureto said line,and a valve operated by the pressure in said line adapted to connect theline to the drain at no pressure, and connect said line to the nozzle ata predetermined-pressure.

4. In combination in a fluid fuel burner, a burner nozzle, a fuel supplyline leading to said nozzle, means for supplying fuel under pressure tosaid line, a valve in said line adapted to open the line for drainingwhen the pressure in theline is low and adapted to close the line fordraining when there is a predetermined pressure in the line.

Signed at Chicago this 15th day of October 1924:.

JOHN E. ROLLING.

